Airworthiness Directive · Amendment 39-14550 · Boeing Model 757 Airplanes
Boeing Model 757 Airplanes
This AD applies to all Boeing Model 757-200, -200PF, -200CB, and -300 series airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Boeing Model 757 airplanes. This AD requires repetitive measurements of the freeplay of each of the three power control units (PCUs) that move the rudder; repetitive lubrication of rudder components; and corrective actions if necessary. This AD results from a report of freeplay-induced vibration of the rudder. The potential for vibration of the control surface should be avoided because the point of transition from vibration to divergent flutter is unknown. We are issuing this AD to prevent excessive vibration of the airframe during flight, which could result in divergent flutter and loss of control of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
The term “service bulletin,” as used in this AD, means the Accomplishment Instructions and Appendix A of the following service bulletins, as applicable:
(1) For Model 757-200, -200PF, -200CB series airplanes: Boeing Special Attention Service Bulletin 757-27-0148, dated June 16, 2005; and
(2) For Model 757-300 series airplanes: Boeing Special Attention Service Bulletin 757-27-0149, dated June 16, 2005.
Within 18 months after the effective date of this AD: Measure the freeplay for each of the three power control units that move the rudder. Repeat the measurement thereafter at intervals not to exceed 12,000 flight hours or 36 months, whichever occurs first. Do all actions required by this paragraph in accordance with the applicable service bulletin.
If any measurement found in paragraph (g) of this AD is outside certain limits specified in the service bulletin: Before further flight, do the applicable related investigative and corrective actions in accordance with the service bulletin.
(i) Within 9 months after the effective date of this AD: Lubricate the rudder components specified in the applicable service bulletin. Repeat the lubrication thereafter at the applicable interval in paragraph (i)(1) or (i)(2) of this AD. Do all actions required by this paragraph in accordance with the applicable service bulletin.
(1) For airplanes on which BMS 3-33 grease is not used: 3,000 flight hours or 9 months, whichever occurs first.
(2) For airplanes on which BMS 3-33 grease is used: 6,000 flight hours or 18 months, whichever occurs first.
If a freeplay measurement required by paragraph (g) of this AD and a lubrication cycle required by paragraph (i) of this AD are due at the same time or will be accomplished during the same maintenance visit, the freeplay measurement and applicable related investigative and corrective actions must be done before the lubrication is accomplished.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
